/Engine/Plugins/Experimental/Mutable/Source/CustomizableObject/Classes/MuCO/CustomizableObjectSystem.h
Show a warning on-screen and via a notification (if in Editor) and log an error when a CustomizableObject is being used and it's not compiled. Callers can add additional information to the error log.
void AddUncompiledCOWarning ( const [UCustomizableObject](API\Plugins\CustomizableObject\MuCO\UCustomizableObject) & InObject, [FString](API\Runtime\Core\Containers\FString) const * OptionalLogInfo )